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// the use case of @headlessui/react is limited to simple usage of Transition | ||
// so implement minimal version on own own | ||
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import { typedBoolean } from "@hiogawa/utils"; | ||
import React from "react"; | ||
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// TODO: rename "enter" => "entering"? | ||
type TransitionState = "enter" | "leaving" | "left"; | ||
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interface TransitionClassProps { | ||
className?: string; | ||
enterFrom?: string; | ||
enterTo?: string; | ||
// TODO | ||
// enter?: string; | ||
// entered?: string; | ||
// leave?: string; | ||
leaveFrom?: string; | ||
leaveTo?: string; | ||
} | ||
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interface TransitionEventProps { | ||
// TODO | ||
// beforeEnter?: () => void; | ||
// afterEnter?: () => void; | ||
// beforeLeave?: () => void; | ||
// afterLeave?: () => void; | ||
} | ||
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export function Transition2( | ||
props: React.PropsWithChildren< | ||
{ show?: boolean } & TransitionClassProps & TransitionEventProps | ||
> | ||
) { | ||
const [state, setState] = React.useState<TransitionState>("left"); | ||
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React.useEffect(() => { | ||
if (props.show && state !== "enter") { | ||
setState("enter"); | ||
} | ||
if (!props.show && state === "enter") { | ||
setState("leaving"); | ||
} | ||
}, [props.show, state]); | ||
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return ( | ||
<> | ||
{state !== "left" && ( | ||
<TransitionInner state={state} setState={setState} {...props} /> | ||
)} | ||
</> | ||
); | ||
} | ||
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function TransitionInner( | ||
props: React.PropsWithChildren< | ||
{ | ||
state: TransitionState; | ||
setState: (v: TransitionState) => void; | ||
} & TransitionClassProps & | ||
TransitionEventProps | ||
> | ||
) { | ||
const [manager] = React.useState( | ||
() => | ||
new TransitionManager({ | ||
classes: { | ||
className: splitClass(props.className ?? ""), | ||
enterFrom: splitClass(props.enterFrom ?? ""), | ||
enterTo: splitClass(props.enterTo ?? ""), | ||
leaveFrom: splitClass(props.leaveFrom ?? ""), | ||
leaveTo: splitClass(props.leaveTo ?? ""), | ||
}, | ||
onChange(state) { | ||
props.setState(state); | ||
}, | ||
}) | ||
); | ||
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React.useSyncExternalStore( | ||
React.useCallback((onStorechange) => manager.subscribe(onStorechange), []), | ||
() => manager.state | ||
); | ||
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// attach to document | ||
React.useEffect(() => { | ||
manager.startEnter(); | ||
}, []); | ||
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// leave | ||
React.useEffect(() => { | ||
if (props.state === "leaving") { | ||
manager.startLeave(); | ||
} | ||
}, [props.state]); | ||
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return ( | ||
<div | ||
ref={React.useCallback((el: HTMLElement | null) => { | ||
el ? manager.onCreate(el) : manager.onDestroy(); | ||
}, [])} | ||
> | ||
{props.children} | ||
</div> | ||
); | ||
} | ||
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class TransitionManager { | ||
private listeners = new Set<() => void>(); | ||
private disposables = new Set<() => void>(); | ||
state: TransitionState = "left"; | ||
el?: HTMLElement; | ||
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constructor( | ||
private options: { | ||
classes: { | ||
className: string[]; | ||
enterFrom: string[]; | ||
enterTo: string[]; | ||
leaveFrom: string[]; | ||
leaveTo: string[]; | ||
}; | ||
onChange: (state: TransitionState) => void; | ||
} | ||
) {} | ||
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onCreate(el: HTMLElement) { | ||
this.el = el; | ||
const classes = this.options.classes; | ||
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// enterFrom | ||
el.classList.remove(...Object.values(classes).flat()); | ||
el.classList.add(...classes.className, ...classes.enterFrom); | ||
} | ||
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onDestroy() { | ||
this.dispose(); | ||
this.el = undefined; | ||
} | ||
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startEnter() { | ||
if (!this.el) return; | ||
this.dispose(); | ||
const el = this.el; | ||
const classes = this.options.classes; | ||
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// enterFrom | ||
el.classList.remove(...Object.values(classes).flat()); | ||
el.classList.add(...classes.className, ...classes.enterFrom); | ||
forceStyle(el); | ||
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// enterFrom => enterTo | ||
el.classList.remove(...classes.enterFrom); | ||
el.classList.add(...classes.enterTo); | ||
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// notify after transition | ||
// this.disposables.add(onTransitionEnd(el, () => {})); | ||
} | ||
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startLeave() { | ||
if (!this.el) return; | ||
this.dispose(); | ||
const el = this.el; | ||
const classes = this.options.classes; | ||
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// leaveFrom | ||
el.classList.remove(...Object.values(classes).flat()); | ||
el.classList.add(...classes.className, ...classes.leaveFrom); | ||
forceStyle(el); | ||
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// leaveFrom => leaveTo | ||
el.classList.remove(...classes.leaveFrom); | ||
el.classList.add(...classes.leaveTo); | ||
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// notify after transition | ||
this.disposables.add(onTransitionEnd(el, () => this.notify("left"))); | ||
} | ||
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private dispose() { | ||
this.disposables.forEach((f) => f()); | ||
this.disposables.clear(); | ||
} | ||
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// api for React.useSyncExternalStore | ||
subscribe(listener: () => void) { | ||
this.listeners.add(listener); | ||
return () => this.listeners.delete(listener); | ||
} | ||
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private notify(state: TransitionState) { | ||
if (this.listeners.size === 0) return; | ||
this.options.onChange(state); | ||
this.listeners.forEach((f) => f()); | ||
} | ||
} | ||
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// | ||
// utils | ||
// | ||
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function onTransitionEnd(el: HTMLElement, callback: () => void) { | ||
// watch `transitionend` | ||
const handler = (e: HTMLElementEventMap["transitionend"]) => { | ||
if (e.target === e.currentTarget) { | ||
dispose(); | ||
callback(); | ||
} | ||
}; | ||
el.addEventListener("transitionend", handler); | ||
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// also setup `transitionDuration` timeout as a fallback | ||
const duration = getComputedStyle(el).transitionDuration; | ||
const subscription = window.setTimeout(() => { | ||
dispose(); | ||
callback(); | ||
}, parseDuration(duration)); | ||
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function dispose() { | ||
el.removeEventListener("transitionend", handler); | ||
window.clearTimeout(subscription); | ||
} | ||
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return dispose; | ||
} | ||
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function parseDuration(s: string): number { | ||
if (s.endsWith("ms")) { | ||
return Number(s.slice(0, -2)); | ||
} | ||
if (s.endsWith("s")) { | ||
return Number(s.slice(0, -1)) * 1000; | ||
} | ||
return 0; | ||
} | ||
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function splitClass(c: string): string[] { | ||
return c.split(" ").filter(typedBoolean); | ||
} | ||
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function forceStyle(el: Element) { | ||
window.getComputedStyle(el).transition ?? console.log("unreachable"); | ||
} |